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김종현,오제용,함승수,이재건,이순흠 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.2
There is a rising hobby in the COVID-19 pandemic era. At this point, camping accidents are also occurring a lot as more people are camping in cars and outdoors. Most of the casualties among them are carbon monoxide poisoning accidents. Therefore, to prevent carbon monoxide poisoning, we measured with an Arduino board using a "DHT22" sensor and an "MQ7" sensor to know temperature, humidity, and carbon monoxide levels, and then printed it out on LCD after storing it in Raspberry Pi database. Therefore, it is implemented through 3D printing on the appearance modeled directly to the actual user.
김인섭,김영석,오제용 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.6
The effects of yield stress on various parameters of Delayed Hydride Cracking (DHC) in pressure tube materials were investigated by experimental tests and by comparing with theoretical models. The DHC test and tension test were conducted at 200℃ for three kinds of zirconium alloys. As yield stress decreased, the threshold stress intensity factor and the striation spacing increased in one alloy, white fracture surfaces and striation were affected by microstructures in all alloys. The DHC velocity decreased as yield stress decreased. Hence, the DHC velocity was predictable by yield stress and DHC model. However, the predicted velocity was a little higher than measured velocity due to slight microstructural differences. The decrease in yield stress improved the resistance against DHC phenomena in pressure tube materials.